lim 200 (30-t)^2
h->0
t=10
The answer should be -8000, but I keep getting -80,000 because I have to do it the long way.
200*20^2 = 200*400 = 80,000
if the answer is -8000 then there has been some mangling.
It seems clear that something is wrong, since ()^2 is always positive.